package com.example.fly.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.example.fly.common.R;
import com.example.fly.dto.DishDto;
import com.example.fly.entity.Category;
import com.example.fly.entity.Dish;
import com.example.fly.entity.DishFlavor;
import com.example.fly.service.CategoryService;
import com.example.fly.service.DishFlavorService;
import com.example.fly.service.DishService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.bind.annotation.*;

import java.math.BigInteger;
import java.util.List;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

/**
 * 菜品管理
 */
@Slf4j
@RestController
@RequestMapping("/dish")
public class DishController {

    @Autowired
    private DishService dishService;

    @Autowired
    private DishFlavorService dishFlavorService;

    @Autowired
    private CategoryService categoryService;

    @Autowired
    private RedisTemplate redisTemplate;

    /**
     * 新增菜品
     * @param dishDto
     * @return
     */
    @PostMapping
    @CacheEvict(value = "dishCache",key = "#dishDto.categoryId + '_1'")
    public R<String> save(@RequestBody DishDto dishDto){
        log.info("dishDto:{}",dishDto);
        dishService.saveWithFlavor(dishDto);

        //清理某个分类下面的菜品缓存
        //String key = "dish_" + dishDto.getCategoryId() + "_1";
        //redisTemplate.delete(key);

        return R.success("菜品新增成功");
    }

    /**
     * 菜品信息分页查询
     * @param page
     * @param pageSize
     * @param name
     * @return
     */
    @GetMapping("/page")
    public R<Page> page(int page,int pageSize,String name){

        //构造分页构造器对象
        Page<Dish> pageInfo = new Page<>(page,pageSize);
        Page<DishDto> dishDtoPage = new Page<>();

        //条件构造器
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
        //添加过滤条件
        queryWrapper.like(name != null,Dish::getName,name);
        //添加排序条件
        queryWrapper.orderByDesc(Dish::getUpdateTime);

        //执行分页查询
        dishService.page(pageInfo,queryWrapper);

        //对象拷贝
        BeanUtils.copyProperties(pageInfo,dishDtoPage,"records");

        List<Dish> records = pageInfo.getRecords();
        List<DishDto> list = records.stream().map((item) ->{
            DishDto dishDto = new DishDto();
            BeanUtils.copyProperties(item,dishDto);
            //分类id
            Long categoryId = item.getCategoryId();
            //按id查询分类对象
            Category category = categoryService.getById(categoryId);
            String categoryName = category.getName();
            dishDto.setCategoryName(categoryName);

            return dishDto;
        }).collect(Collectors.toList());

        dishDtoPage.setRecords(list);

        return R.success(dishDtoPage);
    }

    /**
     * 根据id查询菜品信息和对应的口味信息
     * @param dish
     * @return
     */
    @PostMapping("/getById")
    @CacheEvict(value = "dishCache",key = "#dish.categoryId + '_1'")
    public R<DishDto> getById(@RequestBody DishDto dish){
        log.info("getById:{}",dish.toString());
        log.info("getById:{}",dish.getId());
        DishDto dishDto = dishService.getByIdWithFlavor(dish.getId());

        //清理某个分类下面的菜品缓存
        //String key = "dish_" + dishDto.getCategoryId() + "_1";
        //redisTemplate.delete(key);

        return R.success(dishDto);
    }

    /**
     * 根据id修改菜品信息
     * @param dishDto
     * @return
     */
    @PutMapping
    @CacheEvict(value = "dishCache",key = "#dishDto.categoryId + '_1'")
    public R<String> update(@RequestBody DishDto dishDto){
        dishService.updateWithFlavor(dishDto);

        //Set keys = redisTemplate.keys("dish_*");
        //redisTemplate.delete(keys);

        //清理某个分类下面的菜品缓存
        //String key = "dish_" + dishDto.getCategoryId() + "_1";
        //redisTemplate.delete(key);

        return R.success("修改菜品信息成功");
    }

    /**
     * 根据id单独或批量禁用和启用菜品
     * @param status
     * @param ids
     * @return
     */
    @PostMapping("/status/{status}")
    @CacheEvict(value = "dishCache",allEntries = true)
    public R<String> updateStatus(@PathVariable int status,String[] ids){
        for (String id:ids) {
            Dish dish = new Dish();
            dish.setId(Long.parseLong(id));
            dish.setStatus(status);
            dishService.updateById(dish);
        }
        return R.success("禁用菜品成功");
    }

    /**
     * 根据id单独或批量删除菜品
     * @param ids
     * @return
     */
    @DeleteMapping
    @CacheEvict(value = "dishCache",allEntries = true)
    public R<String> delete(String[] ids){
        for (String id:ids) {
            dishService.removeById(id);
        }
        return R.success("删除菜品成功");
    }

    /**
     * 根据条件来查询菜品数据
     * @param dish
     * @return
     */
    @GetMapping("/list")
    @Cacheable(value = "dishCache",key = "#dish.categoryId + '_' + #dish.status")
    public R<List<DishDto>> list(Dish dish) {
        //List<DishDto> dishDtoList = null;

        //String key = "dish_" + dish.getCategoryId() + "_" + dish.getStatus();

        //先从redis中获取缓存数据
        //dishDtoList = (List<DishDto>) redisTemplate.opsForValue().get(key);

        //如果存在，直接返回，无需查询数据库
        //if(dishDtoList != null){
        //    return R.success(dishDtoList);
        //}

        //构造查询条件
        LambdaQueryWrapper<Dish> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        //添加条件，查询状态为1的（起售状态）
        lambdaQueryWrapper.eq(Dish::getStatus, 1);
        lambdaQueryWrapper.eq(dish.getCategoryId() != null, Dish::getCategoryId, dish.getCategoryId());
        //条件排序条件
        lambdaQueryWrapper.orderByAsc(Dish::getSort).orderByDesc(Dish::getUpdateTime);

        List<Dish> list = dishService.list(lambdaQueryWrapper);

        List<DishDto> dishDtoList = list.stream().map((item) -> {
            DishDto dishDto = new DishDto();

            BeanUtils.copyProperties(item, dishDto);
            Long categoryId = item.getCategoryId();
            //根据id查分类对象
            Category category = categoryService.getById(categoryId);
            if (category != null) {
                String categoryName = category.getName();
                dishDto.setCategoryName(categoryName);
            }

            //当前菜品id
            Long dishId = item.getId();
            LambdaQueryWrapper<DishFlavor> queryWrapper = new LambdaQueryWrapper<>();
            queryWrapper.eq(DishFlavor::getDishId, dishId);
            //SQL: select* from dishflavor where dish_id=?;
            List<DishFlavor> dishFlavorlist = dishFlavorService.list(queryWrapper);
            dishDto.setFlavors(dishFlavorlist);
            return dishDto;
        }).collect(Collectors.toList());

        //如果不存在，需要查询数据库，将查询到的菜品数据缓存到redis
        //redisTemplate.opsForValue().set(key,dishDtoList,60, TimeUnit.MINUTES);

        return R.success(dishDtoList);
    }
}
